Friction window lock



April 19, 1960 w. w. BYARS FRICTION WINDOW LOCK 2 Sheets-Sheet 1Original Filed Aug. 6, 1954 FIG... 1

INVENTOR.

ATTORNEY April 19, 1960 w, w BYARS 2,933,338

FRICTION WINDOW LOCK Original Filed Aug. 6, 1954 2 SheetsSheet 2 i M a I1 3i 6 6 FIG-5- WALL ACEhLB-YARS INVENTOR.

ATTORNEY FRICTION WINDOW LOCK Wallace W. Byars, Kell, Ill.

Substituted for abandoned application Serial No. 448,211,

August 6, 1954. This application April 16, 1959, Serial No. 806,968

1 Claim. (CL 292-83) This invention relates to window locks and is asubstitute application predicated on application Serial No. 448,211,filed August 6, 1954, now abandoned, and the principal object of thisinvention is to provide a friction window lock that will lock the windowat any height desired and will eliminate the rattle and vibrationusually found when conventional window locks are used.

Another object of the invention is to provide a friction lock that bypressure and friction between the window sash and window jamb will lockthe window in closed or open position.

A further object of the invention is to provide a friction window lockthat will efiiciently operate either with a wooden sash and frame or ametal sash and frame.

A still further object of the invention is to provide a friction windowlock that is simple in construction, efiicient in operation and easilyinstalled as desired.

With the above and other objects and advantages in view, the inventionconsists of the minor details of construction, arrangement andcombination of parts more fully hereinafter described, claimed andillustrated in the accompanying drawings in which:

Figure 1 is an interior elevational view of a window sash and windowframe, partly broken away and partly in section, to show theinstallation of a friction window lock embodying the invention;

Figure 2 is a perspective view of the friction window lock embodying theinvention;

Figure 3 is a front elevational view of the friction window lockinstalled in a window sash;

Figure 4 is a vertical sectional view on the line 4-4 of Figure 3,showing the friction window lock in locked position;

Figure 5 is a vertical sectional view similar to Figure 4, showing thefriction window lock in unlocked position, and

Figure 6 is a transverse sectional view on the line 66 of Figure 3.

Referring more in detail to the drawings, wherein like parts aredesignated by like reference numerals a friction window lock embodyingthe invention is generally designated by the reference numeral 10.

' The friction window lock 10 comprises a frame 11 having a pair ofquadrilateral shaped side portions 12 and 13, respectively, which areformed integral with a rectangular shaped base portion 14. The sideportions are in parallel spaced relation to each other by reason of thebase portion 14.

Extending in upwardly inclined relation to the base portion 14 from eachend edge thereof and integral therewith are wing portions 15 and 16,respectively. Extending outwardly from each end of each wing portion andintegral therewith is a foot portion 17 and 18, respectively. The footportions 17 and 18 extend from the end of the wing portions at such anangle that they will lie in the same plane and will be parallel to aplane passed through he base portion 14 of the frame 11.

An elongated flat spring 19 is fixed atone end to the foot 18 andextends between the side portions 12 and 13 of the frame 11 within thewing portion 16i The spring 19terrninatesin an arcuate pressure end 20adjacenttlie wingportionli' Superimposed on the end of the spring19fixed to the foot 18 and fixed to the end of the spring 19, is'o'neend of a pressure plate 21. The pressure plate 21 extends between theside portions 12 and 13 of the frame 11 above the spring 19 andterminates adjacent the wing portion 15.

A friction pad 22 of rubber or other suitable material is fixed to thefree end of the pressure plate 21 in any well-known manner. Slits 23 areformed inwardly and downwardly in the ends of the friction pad 22. Thus,when an attempt is made to open the window by force, the relatively thinportion of the friction pad outwardly of the slits 23 will roll inwardlyupon itself making it impossible to open the window due to the increasedthickness caused by such rolled portion.

Each of the side portions 12 and 13 is provided with an opening 24 whichrotatably receives the trunnions 25 of a cam 26. A square shaped bore 27extends through the trunnions and cam to receive a similarly shaped stem28 of an operating handle 29.

The foot 17 is provided with a screw receiving opening 30, and the foot18, the end of the spring 119 fixed thereto and the end of the pressureplate 21 fixed to the end of the spring 19 are provided with a screwreceiving opening 31.

To install the window lock in the window sash 32 the window sash 32 ismortised as at 33. The friction window lock 10 is placed in position, asshown in Figure 1, and wood screws 34 are inserted into the screwopenings 30 and 31 and when screwed into the sash 32, as in Figures 4and 5, will retain the friction window lock in the mortise in the windowsash. An opening 34 in the window sash 32 communicating with the mortise33 will permit the operating handle 29 to extend outwardly of the sash32, as shown in Figure 6.

The friction window lock is mounted in the window sash 32 so that thefriction pad 22 will engage the window jamb 35 of the window frame, asshown in Figure 1. A sill 36 completes the conventional window frame.

When the window sash 32 is to be locked in position, it is raised to anydesired height and the operating handle 29 turned to force the cam 26into engagement with the spring 19 which in turn applies pressure to thepressure plate 21 so that the friction pad 22 is forcibly engaged withthe jamb 35, as in Figure 4.

The window sash 32 will thus be locked in position until the operatinghandle 29 is turned in the opposite direction to move the cam 26 to theposition shown in Figure 5. A detent 36 is provided in each side portion12 and 13 to prevent the cam 26 from being moved past center so that itcan be turned only from the position of Figure 5 to the position ofFigure 4 or vice versa.

The operation of the window lock is as previously described and it isbelieved that the construction of the same will be apparent to thoseskilled in the art.

It is also to be understood that changes in the minor details ofconstruction, arrangement and combination of parts may be resorted toprovided they fall within the spirit of the invention and the scope ofthe appended claim.

Having thus described the invention what is claimed as new and desiredto be secured by Letters Patent is:

In a friction window lock comprising a frame, a spring mounted in saidframe, a pressure plate mounted in said frame outwardly of said springfor coaction with said spring, and means including a cam mounted on theframe for forcing said spring into engagement with said pressure platewhereby to resiliently force the latter into engage nient with a w indowjamb, the provision of an elongated friction pad on the outer face ofsaidpressure plate, said pad having slits in the ends and extending thewidth end with a portion which will roll upon itself when the P imqved'in an opposite direction in frictional contact 3 with the windowjamb. a

' 'eesaasa- References Cited in the file of this, patent V UNITED STATESPATENTS Jones .L June 6, 1876 Mead Oct. 30, 1877 Heidt May 25, 1897Adickes'.. Nov. 9, 1915

